Hi Earl, there is no set order on how to do, it depends how you want the scales to look.
If you want a dark line between scales then you have to put a dark base on first, then mesh then spray lightly through. You want to let the paint dry before you move the mesh, as long as you don't put too much paint on you can take the mesh right off, if you put too much on then it's going to gob and will make it hard to remove.
A real easy way to do it is get a bunch of small split shot and cut mesh in 1/2, put split shot crimped on 2 opposing sides then line up on table separating split shots on each side by a few inches. Effectively you make a little tunnel, put the lure in and pick it up with the mesh over the lure, spray lightly both sides then when done lower the lure down and let the split shot sit back on the table. You can then drop the lure slightly and pull out easily without touching anything. Some use a sewing hoop to spray through, some use office supply binder clips to pull the mesh in tight to the lure and hold in position.
The mesh is re-useable and can be wiped down with a paper towel, or as in the case with water based paints soak under the faucet.
I have found the nicest effects by doing the belly, then side, then scale then top/back color.